Baxi 748 Installer's Manual page 11

INSTALLER GUIDE
3.3.4 The flue must serve only one fireplace.
3.4 The flue must conform to BS 5440: Part 1 in design and installation.
The flue, measured from the bottom of the fireplace opening to the bottom of the
terminal, shall be not less than 3m in actual vertical height. When calculated in
accordance with BS 5440: Part 1 Annex A, the minimum equivalent height of the flue
shall be 2.0m of 125mm dia. flue pipe.
3.5 The flue must not be used for any other appliance or application.
3.6 Any chimney dampers or restrictors should be removed. If removal is not possible
they must be fixed in the open position.
3.7 If the appliance is intended to be installed to a chimney, which was previously used
for solid fuel, the flue must be swept clean prior to installation. All flues should be
inspected for soundness and freedom from blockages.
3.8 If the fireplace opening is an underfloor draught type, it must be sealed to stop any
draughts.
3.9 The appliance must be mounted behind a non-combustible hearth unless the
conditions of section 3.2.1.1 are met (N.B. conglomerate marble hearths are considered
as non-combustible). The appliance can be fitted to a purpose made proprietary class
"O"-150°C surround. The hearth material must be at least 12mm thick. The periphery of
the hearth (or fender) should be at least 50mm above floor level to discourage the
placing of carpets or rugs over it.
The appliance must not stand on combustible materials or carpets (See figure 1).
3.10 The front face of the fireplace should be reasonably flat over the area covered by
the hotbox top and side flange seals to ensure good sealing. These faces should be made
good if necessary. The fireplace floor should be reasonably flat to ensure that a good
seal with the hotbox can be made.
Page 11
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Baxi Heating U.K. Limited 2006.